What year did the Oklahoma City bombing take place? When did man first walk on the moon? When did O-U Stadium open? Here’s one more, one that some 30 percent of respondents in a recent survey couldn’t get: What year did the 9/11 terrorist attacks take place? Editor Don Whitten takes a look at how we can remember lots of events just as if they were yesterday, but we can’t recall the year they took place. How’s your memory? (April 4, 2011, Page 4A)